package com.cy.sp06.fallback;

import com.cy.web.utils.JsonResult;
import org.springframework.cloud.netflix.zuul.filters.route.FallbackProvider;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.http.client.ClientHttpResponse;
import org.springframework.stereotype.Component;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.nio.charset.StandardCharsets;

@Component
public class ItemFallBack implements FallbackProvider {
    //针对哪个服务应用当前降级类
    //返回服务id
    //　item-service - 只针对商品服务降级
    //  * - 所有服务降级
    //  null - 所有服务降级
    @Override
    public String getRoute() {
        return "item-service";
    }

    @Override
    public ClientHttpResponse fallbackResponse(String route, Throwable cause) {
        return new ClientHttpResponse() {
            @Override
            public HttpStatus getStatusCode() throws IOException {
                return HttpStatus.INTERNAL_SERVER_ERROR;
            }

            @Override
            public int getRawStatusCode() throws IOException {
                return HttpStatus.INTERNAL_SERVER_ERROR.value(); //500
            }

            @Override
            public String getStatusText() throws IOException {
                return HttpStatus.INTERNAL_SERVER_ERROR.getReasonPhrase();
            }

            @Override
            public void close() {
                // BAIS 流是内存数组的流，不占用底层系统资源
                // 不需要 close() 释放资源

            }

            @Override
            public InputStream getBody() throws IOException {
                String json = JsonResult.err().code(500).msg("系统服务故障").toString();
                return new ByteArrayInputStream(json.getBytes(StandardCharsets.UTF_8));
            }

            @Override
            public HttpHeaders getHeaders() {
                HttpHeaders httpHeaders = new HttpHeaders();
                httpHeaders.add("Content-Type", "application/json;charset=UTF-8");
                return httpHeaders;
            }
        };
    }
}
